7640655 has 16 divisors (see below), whose sum is σ = 13336704. Its totient is φ = 3704480.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640655 is 5560467.

It is not a de Polignac number, because 7640655 - 2¹⁴ = 7624271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22989 + ... + 23318.

It is an arithmetic number, because the mean of its divisors is an integer number (833544).

Almost surely, 2^7640655 is an apocalyptic number.

7640655 is a deficient number, since it is larger than the sum of its proper divisors (5696049).

7640655 is a wasteful number, since it uses less digits than its factorization.

7640655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46326.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 7640655 is about 2764.1734750193. The cubic root of 7640655 is about 196.9594684151.

The spelling of 7640655 in words is "seven million, six hundred forty thousand, six hundred fifty-five".